Cotton strippl machine



Nov. 28, 950 B. M. HYMAN 2,532,065

COTTON sTRIPPER MACHINE Filed Jan. 28, 1948 6 Sheets-Sheet l [WI [W707iB. M. HYMAN COTTON STRIPPER MACHINE Nov. 28 1950 6 Sheets-Sheet 2' FiledJan. 28, 1948 Nov. 28, 1950 B. M. HYMAN 2,532,065

COTTON STRIPPER MACHINE Filed Jan. 28, 1948 6 Sheets-Sheet 3 INVENTOR.if 2 02072 B. M. HYMAN COTTON STRIPPER MACHINE Nov. 28, 1950 6Sheets-Sheet 4 Filed Jan. 28, 1948 Nov. 28, 1950 B. MQHYMAN 2,532,065

COTTON sm'IPPER MACHINE Filed Jan. 28, 1948 s Sheets-Sheet s PatentedNov. 28, 1950 COTTON STRIPPL MACHINE Benjamin M. Hyman, Moline, Ill.,assignor to International Harvester Company, a corporation of New JerseyApplication January 28, 1948, Serial No. 4,759

Claims. v1

This invention relates to machines for stripping cotton bolls from rowsof plants in the field, and concerns more particularly a stripper unitcontaining companion stripper rollers which are endwise advanceablealong opposite sides of a plant row for stripping the plants of theirbolls, and a new conveyor system for delivering the stripped bolls to anelevator.

A cotton stripper unit constructed according to the principles of thisinvention comprises a framelike housing divided at a forward end thereofto form a plant receiving throat and companion stripper rollersextending in parallelism upwardly and rearwardly from the front orentrance end of the throat and disposed upon opposite sides of a medianline thereof. An object of this invention is the provision of an augertrough in one part of the divided stripper unit casing for receivingstripped bolls discharged laterally from the stripping rollers.

A further object is the provision of journaled mountings for thestripper rollers, so arranged that the roller most remote from the augertrough is at higher elevation than the roller adjacent to the trough toexpedite discharge of the stripped bolls toward the trough.

Another object is the provision of a cotton stripper unit having anauger trough communicative at a rear portion thereof with an elevatorhopper and containing an auger provided with a paddle portionregistering with the communication between the trough and hopper fordischarging the stripped cotton into the hopper when such cotton ismoved rearwardly in the trough sufficiently far to be engaged by thepaddle.

Still a further object is the provision of a tractor-mountable cottonstripper unit embodying a housing of which the forward portion isdivided into laterally spaced parts which form a plant receiving throat,rearwardly and upwardly inclined stripping rollers on respective sidesof a median line extending longitudinally of the throat, a substantiallyhorizontal auger trough in one of said housing parts and extendingrearwardly along one side of and below the adjacent stripper roller, andthe auger trough extending rearwardly of the housing for adapting it todirect stripped cotton bolls beneath an axle housing of a tractorwhereon the housing is mounted forwardly of such axle housing alongsideof the tractor engine.

An additional object is the provision of a tractor-mountable cottonstripper apparatus wherein there is a frame disposed rearwardly of rearaxle housings of the tractor and having an en:-

vator hopper disposed rearwardly of and below the axle housings, astripper unit projecting forwardly from one side of the hopper fordisposition below and forwardly of one of the axle housings andalongside of the tractor body, the unit having a pivotal connection withthe frame to facilitate vertical adjustment of the front end of suchunit, and the unit comprising a laterally divided housing to form aplant receiving throat, stripping rollers extending upwardly andrearwardly in the throat on opposite sides of a longitudinal median linethereof, an auger trough extending horizontally alongside of one of thestripping rollers and rearwardly into communicative registry with theelevator hopper, and an auger in the trough forprogressing the strippedcotton bolls rearwardly of the trough and discharging the same into theelevator hopper.

Referring now to the drawings:

Fig. 1 is a side elevational view of a tractor having the nearesttraction wheel removed for exposing, in side elevation, a cottonstripper unit constructed according to the principles of this inventionand mounted on the tractor.

Fig. 2 is a front elevational view of the tractor and cotton strippingapparatus shown in Fig. 1,

' this view also showing a cotton stripper unit at the opposite side ofthe tractor and a portion of an elevator which projects upwardly andrearwardly from the tractor and from a hopper which receives cotton fromthe two stripper units.

Fig. 3 is a rear elevational view of the tractor and of a supportingframe which is attached to the rear axle housings of the tractor toserve as mounting means for rear ends of the cotton stripper unitsprojecting forwardly therefrom.

Fig. 4 is a vertical sectional view taken substantially on the irregularline 4-4 of Fig. 6.

Fig. 5 is a vertical sectional view taken longitudinally of one of thestripper units substantially upon the irregular line 55 of Fig. 6.

Fig. 6 is a fragmentary plan view, partly diagrammatic, and withportions of the tractor and the casing cover of the stripper unit brokenaway for exposing a rear portion of the auger and auger trough and powertransmitting mechanism for driving the auger and the stripper rollers.

Fig. 7 is a vertical sectional view taken on the line I! of Fig. 5,showing the relative position of the stripper rollers, the auger trough,and the auger in such trough.

Fig. 8 is a fragmentary rear elevational view of the hopper and stripperunit supporting frame, a portion of the elevator being removed and aportion of the side walls thereof being shown in cross section forexposing drive sprockets for the elevator belt.

Fig. 9 is a fragmentary view showing the rear end of an auger shafttogether with abevelled drive gear therefor and a bearing unit in whichthe shaf t is rotatably supported.

Fig. 10 is a detail showing the manner in which the front end of anauger shaft is rotatably supported.

Figs. 11 and 12 are enlarged fragmentary views showing details of abearing support for the front end of one of the stripper rollers.

Fig. 13, on the sheet with Fig. 3, is a fragmentary rear elevationalview of the frame at the rear of the tractor together with a main jawclutch and shifting lever therefor for selectively establishing anddisestablishing a driving connection for the stripper apparatus.

Fig. 14 is a side elevational view of the tractor and one of thestripper units of which a portion is broken away for exposing ahydraulic ram mounted beneath the tractor and connected with the unitsfor supporting them at desired elevations or raising them to a transportposition.

Fig. 15 is a plan view of the hydraulic ram and a pivotally mountedframe forming an operative connection between such ram and the stripperunits.

Fig. 16 is a plan view of the stripper umt supporting frame,illustrating the manner of attachment thereto to the rear axle housingsof the tractor.

Fig. 17 is a side elevational view of the structure illustrated in Fig.16.

The cotton stripper apparatus herein illustrated employs two stripperunits 2| and 22. These units are mounted upon opposite sides of atricycle type tractor 23 having rear traction wheels 24 and 25constrained for rotation with axles 26 and 21 which project outwardlyfrom axle housings 28 and 29. The body 3| of the tractor projectsforwardly from the usual differential housing 32 to which the axlehousings 28 and 29 are secured, such body including an engine 33.

Each stripper unit comprises a housing 34 with laterally spaced portions35 and 36 providing a plant-receiving throat 31 open at the forward endof the unit. A pair of stripper rollers 38 and 39, on opposite sides ofa longitudinal median line of the throat 31, are journaled in each ofthe stripper unit housings 34. These companion stripper rollers areinclined upwardly from a forward portion of the throat 31 to a rearwardportion thereof as illustrated in Fig. 5. During operation of theapparatus, the tractor will be driven lengthwise of a pair of adjacentplant rows, the wheels 40 of the front steering truck 4| of the tractorthen following av track half way between the rows while the tractionwheels 24 and 25 straddle such pair of rows. This causes the stripperunit throats 31 to respectively register with the plant rows and theplant stems to be received between the companion stripper rollers 38 and39. Meanwhile, the stripper rollers of each unit are being rotated inthe direction indicated by the arrows in Figs. 4 and 7, and as therollers advance lengthwise of the plant row, they also advance upwardlyof the plant stalks. Because of the proximity of the rollers, the bollsof the mature crop are thus pinched from the stalks and discharged intoan auger trough 42, which is plant stalks from which the bolls areremoved in this manner are allowed to remain in the soil and the upperportions of these plants withdrawn downwardly from between the rollers35 and 39 as the machine proceeds along the plant row.

The augers 43 within the troughs 42 are rotated in the proper directionfor advancing the removed cotton bolls rearwardly within the troughs 42into registry with communications 44 between rearward portions of thesetroughs and a hopper 45. Each of the angers 43 has a radial paddle 46for discharging the cotton bolls through the communications or openings44 into the elevator hopper 45. The elevator 41 conveys the cotton bollsfrom the hopper 45 upwardly for discharge into the box of the wagon orthe like (not shown) which may be towed behind the tractor.

Support for the elevator hopper 45, the elevator 41, and the stripperunits 2| and 22 is provided by a frame structure 48 mounted upon andprojecting rearwardly from the tractor axle housings 25 and 29. Thisfram structure 48 is shown by itself in Figs. 16 and 17. Each axlehousing 28 and 29 has a mounting bar 49 fastened thereto by clampingbolts 5| and an oppositely disposed complemental clamping bar 52. Framestructure 48 comprises a pair of bracket like members 53. each having anupright footing section 54 for respective connection with the uprightbars 49 by means of eye bolts 55 which are pivotally secured to the bars49 by pins 56. Frame brackets 53 are welded to a transverse tube 51. Asecond transverse tube 58 is secured to the tube 51 by a pair ofperipherally flanged plates 59 and at third plate 6|, Fig. 16. Plates 59and 61 are welded to the tubes 51 and 58. A pair of horizontal bracemembers 62 are welded at their ends to brackets 53 and plates 59.Depending portions 63 of the plates 59 support bearings 64 for atransverse shaft 65, Fig. 3. A pair of downwardly and rearwardlyprojecting plate-like arms 66 are welded to and supported by thetransverse tube 51, and these arms 66 carry ball bearing units 61, Fig.8, which are also for the shaft 65. Rearward extensions 59 at the lowerends of the arms 59 support a transverse drawbar 69 extendingtherebetween and welded thereto, this drawbar havin an aperturedcoupling bracket 1! fastened thereto for the detachable connection of atrail-behind vehicle to the tractor.

Driving force for both cotton stripping unit 2! and 22 is obtained froma sprocket wheel 12 which is mounted upon and constrained for rotationwith the driving axle 21 for the traction wheel 25; see Figs. 2. 3, and6. A chain 13 is driven by the sprocket 12 for driving a sprocket 14which is journaled upon a shaft 15, which extends through the framestructure tube 59, Figs. 16, 17, 5, and 6, wherein such shaft issupported upon bearings (not shown). Hub 16 of the sprocket 14 isnotched at 11, Figs. 3, 6, and 13, for receiving teeth 18 on a clutchmember 19 which is constrained for rotation with the shaft 15 and urgedaxially of this shaft by a spring 8| pressing the teeth 19 intoassociated notches 11 (one being shown) to establish a disconnectibledriving connection between the sprocket 14 and the shaft 15.

Means for controlling engagement of the jaw clutch 11-18 comprises abell-crank lever 82 pivoted at 83 upon an arm 84 welded to thetransverse frame structure tube 58 at 85; see Figs. 3, 13, and 16. Anupwardly projecting leg 85 of the bell-crank 92 is abuttable againstjawclutch element 19 for compressing the spring II and displacing thiselement to the position illustrated in Fig. 3 for holding the clutchII-l8 disengaged. This condition prevails when a horizontal leg 8'! ofthe bell-crank is lifted upwardly by control rod 88. of which the upperend is accessible to an operator occupying the tractor seat 89. Afterlifting the control rod 88, a projection 9I thereon is inserted into atransverse portion 92 of a slot 93 within a bracket 94 which is weldedto the transverse tube 58. When the control rod 88 is manipulated forbringing the stud 9I into registry with the vertical portion of the slot93 and released, the spring 8| will be effective for meshing theengageable clutch I'|I8 incident to pivoting the bell-crank 82 andcausing the associated parts to occupy the positions illustrated in Fig.13.

A right end portion of the shaft 15, as viewed in Fig. 3, carries asprocket 85 which is normally constrained for rotation therewith bymeans of a rosette slip clutch comprising a scalloped element 96constrained for rotation with the shaft and urged by a spring 95 intomesh with a complementally scalloped end of the sprocket hub 91.

A chain 99 is trained over the sprocket 95 and a sprocket I8I therebeiowon the transverse shaft 65, Fig. 3, 5, and 8. In this manner the shaft85 is driven in the direction indicated by the arrow in Fig. 8 when thetractor is driven forwardly. An idler sprocket I88 mounted on a stubshaft I88", Figs. 3 and 5, is for maintaining desired tautness in thechain 99. A pair of elevator belt driving sprockets I82, Figs. 3, 4, and8, are constrained for rotation with the shafts 65. The rearwardly andupwardly extending elevator 41, having side plates I84, is pivotableabout the shaft 65 and encloses the sprockets I82 and an undershotcleated conveyor I85, which has chains I86 at its opposite edges trainedover the sprockets I82 and complemental sprockets (not shown) at theupper end of the elevator. Brace rods I81, Figs. 1 and 2, are connectedbetween an upper end portion of the elevator and anchorages I88 onrespective sides of the tractor to prevent downward swinging of theelevator about the axis of the transverse shaft 65. Rotation of theshaft 65 in the direction indicated by the arrow in Fig. 8 will causethe sprockets I82 to rotate the cleated elevator belt I85 in thedirection to carry its upper flight downwardly lengthwise of theelevator 41 and to carry its lower flight upwardly in opposed relationwith the underside I89 of the elevator casing. The paddles or cleatsII8, Fig. 4, upon the elevator belt I85 withdraw cotton bolls from thehopper 45, Fig. 6, and while trapping these bolls between the lower beltflight and the bottom I89 of the elevator convey these bolls upwardlyfor discharge into the box of a wagon or the like coupled onto thetractor in trail-behind fashion.

Referring now to the right-hand stripper unit as viewed from 'the rearin Fig. 3, the auger trough of this unit has a rear end plate I I5,Figs. 3 and 6, carrying a rearwardly projecting bracket IIB which has asleeve bearing II'I pivotably mounted on the outer race of theassociated ball bearing unit 61; see Fig. 8, where a vertical sectionalview illustrates in detail the mounting of the left-hand stripper unitupon its associated bearing unit 61. Inasmuch as the parts on theleft-hand side of the drive for the power units are the same as on theright-hand side, the same reference characters are used on the twosymmetrical structures illustrated in Fig. 8. These pivotal mountings ofthe sleeve bearings II'I facilitate vertical adjustment of the front endportion of the stripper units 2| and 22 about the axis of the transversedrive shaft 85. When the apparatus is in operation a chain I I8. Fig. 5,connected between an anchorage II9 on the associated side sill of thetractor and an anchorage (not shown) on the inner side of the stripperunit 2I supports the front end of such unit a short distance above theground line G. A similar chain is connected with the unit 22 on theother side of the tractor.

A rear end portion of the auger shaft 43 projecting rearwardly throughthe end wall II5 of the stripper unit 2| carries a bevel pinion I2Imeshed with and driven by a pinion I22 which is constrained for rotationwith the shaft 65. In this manner the auger shaft 43 is caused to rotatein the direction indicated by the arrow in .Fig. 4 during forwardmovement of the vehicle.

An outer end portion of the shaft projects through the right-hand framemember 88, Fig. 8. wherein it is journaled, and this outer end portionof the shaft 65 carries a sprocket I23 of which the hub I24 isconstrained for rotation with the shaft. Sprocket I23 and chain I25trained thereabout, Figs. 1, 3, and 6. are shielded from groundobstruction by a guard pan I28 carried by the auger trough end plate H5and the outer wall of the stripper unit 2|.

Chain I 25 has upper and lower flights projecting forwardly from thesprocket I23, the lower of these flights being trained beneath an idlersprocket I21, and the upper of these flights being trained beneath anidler sprocket I28, Fig. 1. These two sprockets I21 and I28 arejournaled upon stub shafts I29 and I3I, Fig. 5, suitably anchored in'thecasing of the stripper unit 2|. An upwardly turned forward end' portionof the chain I25 is trained over a sprocket I32 mounted on the outer endof a shaft I33 which is constrained for rotation therewith. This shaftis rotatably supported in the stripper unit casing as illustrated inFig. 6, where it is also shown to carry a bevel pinion I34 meshed with acompanion bevel pinion I35 upon the upper rear end of the flutedstripper roller 39. The upper end of the fluted stripping roller isrotatably supported in a bearing I36 which is secured to a transverseplate I31 having a hole (not shown) for receiving a section of theroller. The lower end of the roller 39 is journaled upon a spindle I38pivotally carried at I48 by a bracket I39, Figs. 11 and 12, having afooting portion I4I containing a slot I42 for receiving an anchoragepost I43 which is mounted on the stripping unit housing at one side ofthe plant receiving throat. When a nut I44 is loosened on the threadedbolt I43, the bracket I39 and the roller 39 thereon can be adjustedvertically. Note that the footing portion I4I of the bracket I39 is in avertical plane as shown in Figs. 2 and 11 when installed on the stripperunit instead of in a horizontal plane as shown for convenience in Fig.12. A notch I45 in a plate I46 secured to an element I41 of the stripperunit casing receives the bolt I43.

A similar bearing structure for the support of the lower end of thestripper roller 38 includes a bearing member corresponding to thebearing I38 and carried upon a bracket I39 corresponding to the bracketI39. These two brackets I39 and I39, as illustrated in Fig. 6, aresecured to portions of the stripper unit casing on opposite asaaoessides of the median line M (Fig. 8) extending lengthwise of the plantreceiving throat. The rear upper end of the stripping roller 88 isjournaled ina bearing I carried by the plate It! and is driven by a gearI48 constrained for rotation with this roller and meshed with a gear IIIwhich is constrained forrotation with the roller I9. I

In Fig. 10 a pilot bearing stud I62 for the front lower end of the auger43 is illustrated. The front end wall I53 upon which the pilot bearingstud I52 is anchored is shown in Figs. 5 and 6.

The left-hand stripping unit 22 is constructed I and driven similarly tothe stripping unit 2I. The auger of unit 22 is driven by gears HI andI22 shown in the left-hand portion of Fig. 8 and identical with thegears I2I and I22 shown in the right-hand part of such figure. The leftend of the shaft 65 as viewed from the rear carries a sprocket (notshown) corresponding to the sprocket I23, Figs. 1 and 6, for driving achain corresponding to the chain I25 through which power is transmittedto the stripping rollers 38 and 38 of the unit 22.

Means for adjusting the heightof the front ends of the stripping units2i and 22 to any desired position above a lower limit determined by thechains II6, Figs. 1 and 5, and for raising the front ends of these unitsto a transport position comprises a hydraulic ram I54 disposed beneaththe body of the tractor and having one end of its cylinder pivotallyconnected at I55 with a tractor-mounted bracket I56. The plunger I51 ofthis ram is connected by a rod I68 with a bracket I69 on a cross pieceI6I of a pivoted frame I62 having side pieces I63 pivotally connected bypins I64 with brackets I65 depending from opposite sides of the tractorbody. A rod I66 extending between the stripper units 2i and 22 carriesrollers I61 which rest upon and are rollable along the side members I63.When fluid is introduced into the rear end of the ram I 54 from a sourceof fluid (not shown) under pressure through a hose I68, the plunger I51and rod I68 will be forced forwardly and cause the frame I62 to bepivoted upwardly, carrying with it the rollers I61 as they roll upon themembers I63, thereby causing upward movement of the front ends of thestripper units 2i and 22. By controlling the amount of fluid in the ramthe elevation of the stripper units may be selectively controlled.

The machine is placed in operation by moving the control lever 88 fromthe neutral position illustrated in Fig. 3 into'the drive connectingposition illustrated in Fig. 13. This permits the spring 8| to engagethe jaw clutch 11-16. A wagon will be hitched on behind the tractor bycoupling it to the drawbar member coupling 1I. At this time the tractorwill be stationed at the ends of two plant rows with which the throats31, Fig. 2, of the stripper units 2| and 22 respectively register.Wheels 40 of the steering truck I will be between these two plant rows,and the traction wheels 24 and 25 will be on the outer sides of thesetwo rows. When the vehicle is started forwardly, driving force for thestripping apparatus will be transmitted from the axle 21, Fig. 2, to thesprocket 12 constrained for rotation therewith. Power from the sprocket12 is transmitted through the chain 13, Fig. 6, to the sprocket 14 andthence through the jaw clutch 1116, to the cross shaft 16, thencethrough the rosette clutch 9691 (Fig. 3), to the sprocket 96 (Figs. 1and 3), chain 99 and sprocket IUI to the cross shaft 66. This shaftdrives the elevator sprockets I02, whereby the elevator belt is revolvedfor transferring stripped cotton bolls from the elevator hopper 46. Fig.6, upwardly in the elevator for discharge into the trail-behind wagon,as the vehicle moves forwardly.

Sprockets I23 on opposite ends of the cross shaft 6! drive therespectively associated chains I2! and the stripper unit shafts I.whereby through the gears I and III the stripping rollers 39 are driven.and through the gears III and I" (those of the right-hand unit, 2| beingshown in Fig. 6) cause the stripping rollers a to be driven. Strippingrollers 36 and 36 and the auger shafts (driven through companion beveledgears I22 and I2I) are caused to rotate in the direction shown in Fig.4. Plant lifters I16 at the front of the units 2i and 22 lift the lowerstems of the plants upwardly and guide the plant stalks into the spacebetween the associated companion stripping rollers 38 and $6. 'Iheserollers 26 and 39 in each unit are spaced apart sumciently to avoidgripping and pulling the plants from the ground, but are sumcientlyclose together to prevent passage of the bolls therebetween (Fig. 4) andthereby pinch of! the bolls and cause them to be discharged sidewiseinto the auger trough 42 associated therewith. Arrangement of eachstripping roller 88 above its companion stripping roller it facilitatesdischarge of the removed bolls transversely of the rollers in thedirection of the associated auger trough. Those bolls discharged intothe auger troughs are advanced rearwardly by the rotating angers 43 intoregistry with the passages 44 through which they are discharged by thepaddles 40 into the elevator hopper 45, Fig. 6, from which they areelevated for discharge into the trail-behind wagon in theabove-described manner.

Having thus described a. single preferred embodiment of the inventionwith the view of clearly and concisely illustrating the same. I claim:

1. In a cotton stripping apparatus for use upon a tractor having a bodyprojecting forwardly from a rear axle extending transversely of a rearportion of such body; said apparatus. when mounted upon the tractorcomprising an elevator hopper, disposed rearwardly of said body andbelow said axle. a cotton :tripper unit including stripper rollersdisposed forwardly of said hopper alongside respective sides of thetractor body and projecting downwardly and forwardly from their rearends, auger troughs disposed below said stripper rollers and solelybetween the tractor body and respective of said rollers, said troughsextending lengthwise and alongside of said rollers for receivingstripped cotton bolls therefrom. said troughs projecting rearwardly ofthe rear ends of said rollers at respective opposite sides of saidhopper and where each trough has a side wall with an openingcommunicative with said hopper, augers in said troughs, said augers eachhaving a radially extending paddle on a rear portion thereof in registrywith the opening of its associated trough, and means for rotating saidstripper rollers and said augers while rotating the augers in adirection to transfer the bolls rearwardly in the troughs intoregistration with their paddles and said paddles being operative topropel the bolls through said openings into the hopper.

2. In a cotton stripping machine, a pair of complemental strippingrollers projecting downwardly and forwardly from rear ends thereof, anauger trough disposed alongside of one of said rollers for receivingcotton bolls stripped from plants by said rollers, and journal meanssupporting said rollers for rotation about their respective axes and forsupporting the other of said rollers at higher elevation than said onethereof to facilitate discharge of the stripped bolls into the trough.

3. In a cotton stripping machine, a cotton stripper unit comprising acasing, said casing having laterally spaced portions providing a plantreceiving throat open at a forward end of said unit, a pair ofcomplemental stripper rollers rotatably mounted in said casing atrespective sides of a longitudinal median line of said throat, an augertrough in said casing extending lengthwise of said rollers beside one.thereof and below the same for receiving stripped cotton bollsfrom saidrollers, said trough being within one of the por tions of said casing,and the other portion of said casing having a wall extending alongsidethe other of said rollers and projecting thereabove for deflectingstripped bolls across the rollers into said trough.

4. The combination set forth in claim 3, wherein the other of saidrollers is supported at higher elevation than the one thereof tofacilitate discharge of the stripped cotton bolls into said trough.

5. In a 'cotton stripping machine, a cotton stripper unit comprising acasing having forward and rear ends and divided at its forward end intolaterally spaced portions defining a plant receiving throat, an augertrough in one of said casing portions, said auger trough extendinghoriz'ontally in substantial parallelism with and upon one side of alongitudinal median line of said throat, said auger trough projectingrearwardly from the rear end of said casing, a pair of stripper rollerson respectively opposite sides of said the one casing portion to deflectthe stripped cotton across the rollers into said trough.

BENJAMIN 'M. HYMAN.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Date Number Name 1,757,580 Lower et a1 May 6, 19301,842,737 Tharp Jan. '2, 1932 1,959,070 Thomann May 15, 1934 2,001,079Court May 14, 1935 2,214,818 Johnston Sept. 17. 1940

